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 #include &lt;QtGui&gt;
 #include &quot;treemodelcompleter.h&quot;
 #include &quot;mainwindow.h&quot;

 MainWindow::MainWindow(QWidget *parent)
     : QMainWindow(parent), completer(0), lineEdit(0)
 {
     createMenu();

     completer = new TreeModelCompleter(this);
     completer-&gt;setModel(modelFromFile(&quot;:/resources/treemodel.txt&quot;));
     completer-&gt;setSeparator(QLatin1String(&quot;.&quot;));
     QObject::connect(completer, SIGNAL(highlighted(const QModelIndex&amp;)),
                      this, SLOT(highlight(const QModelIndex&amp;)));

     QWidget *centralWidget = new QWidget;

     QLabel *modelLabel = new QLabel;
     modelLabel-&gt;setText(tr(&quot;Tree Model&lt;br&gt;(Double click items to edit)&quot;));

     QLabel *modeLabel = new QLabel;
     modeLabel-&gt;setText(tr(&quot;Completion Mode&quot;));
     modeCombo = new QComboBox;
     modeCombo-&gt;addItem(tr(&quot;Inline&quot;));
     modeCombo-&gt;addItem(tr(&quot;Filtered Popup&quot;));
     modeCombo-&gt;addItem(tr(&quot;Unfiltered Popup&quot;));
     modeCombo-&gt;setCurrentIndex(1);

     QLabel *caseLabel = new QLabel;
     caseLabel-&gt;setText(tr(&quot;Case Sensitivity&quot;));
     caseCombo = new QComboBox;
     caseCombo-&gt;addItem(tr(&quot;Case Insensitive&quot;));
     caseCombo-&gt;addItem(tr(&quot;Case Sensitive&quot;));
     caseCombo-&gt;setCurrentIndex(0);

     QLabel *separatorLabel = new QLabel;
     separatorLabel-&gt;setText(tr(&quot;Tree Separator&quot;));

     QLineEdit *separatorLineEdit = new QLineEdit;
     separatorLineEdit-&gt;setText(completer-&gt;separator());
     connect(separatorLineEdit, SIGNAL(textChanged(const QString&amp;)),
             completer, SLOT(setSeparator(const QString&amp;)));

     QCheckBox *wrapCheckBox = new QCheckBox;
     wrapCheckBox-&gt;setText(tr(&quot;Wrap around completions&quot;));
     wrapCheckBox-&gt;setChecked(completer-&gt;wrapAround());
     connect(wrapCheckBox, SIGNAL(clicked(bool)), completer, SLOT(setWrapAround(bool)));

     contentsLabel = new QLabel;
     contentsLabel-&gt;setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
     connect(separatorLineEdit, SIGNAL(textChanged(const QString&amp;)),
             this, SLOT(updateContentsLabel(const QString&amp;)));

     treeView = new QTreeView;
     treeView-&gt;setModel(completer-&gt;model());
     treeView-&gt;header()-&gt;hide();
     treeView-&gt;expandAll();

     connect(modeCombo, SIGNAL(activated(int)), this, SLOT(changeMode(int)));
     connect(caseCombo, SIGNAL(activated(int)), this, SLOT(changeCase(int)));

     lineEdit = new QLineEdit;
     lineEdit-&gt;setCompleter(completer);

     QGridLayout *layout = new QGridLayout;
     layout-&gt;addWidget(modelLabel, 0, 0); layout-&gt;addWidget(treeView, 0, 1);
     layout-&gt;addWidget(modeLabel, 1, 0);  layout-&gt;addWidget(modeCombo, 1, 1);
     layout-&gt;addWidget(caseLabel, 2, 0);  layout-&gt;addWidget(caseCombo, 2, 1);
     layout-&gt;addWidget(separatorLabel, 3, 0); layout-&gt;addWidget(separatorLineEdit, 3, 1);
     layout-&gt;addWidget(wrapCheckBox, 4, 0);
     layout-&gt;addWidget(contentsLabel, 5, 0, 1, 2);
     layout-&gt;addWidget(lineEdit, 6, 0, 1, 2);
     centralWidget-&gt;setLayout(layout);
     setCentralWidget(centralWidget);

     changeCase(caseCombo-&gt;currentIndex());
     changeMode(modeCombo-&gt;currentIndex());

     setWindowTitle(tr(&quot;Tree Model Completer&quot;));
     lineEdit-&gt;setFocus();
 }

 void MainWindow::createMenu()
 {
     QAction *exitAction = new QAction(tr(&quot;Exit&quot;), this);
     QAction *aboutAct = new QAction(tr(&quot;About&quot;), this);
     QAction *aboutQtAct = new QAction(tr(&quot;About Qt&quot;), this);

     connect(exitAction, SIGNAL(triggered()), qApp, SLOT(quit()));
     connect(aboutAct, SIGNAL(triggered()), this, SLOT(about()));
     connect(aboutQtAct, SIGNAL(triggered()), qApp, SLOT(aboutQt()));

     QMenu* fileMenu = menuBar()-&gt;addMenu(tr(&quot;File&quot;));
     fileMenu-&gt;addAction(exitAction);

     QMenu* helpMenu = menuBar()-&gt;addMenu(tr(&quot;About&quot;));
     helpMenu-&gt;addAction(aboutAct);
     helpMenu-&gt;addAction(aboutQtAct);
 }

 void MainWindow::changeMode(int index)
 {
     QCompleter::CompletionMode mode;
     if (index == 0)
         mode = QCompleter::InlineCompletion;
     else if (index == 1)
         mode = QCompleter::PopupCompletion;
     else
         mode = QCompleter::UnfilteredPopupCompletion;

     completer-&gt;setCompletionMode(mode);
 }

 QAbstractItemModel *MainWindow::modelFromFile(const QString&amp; fileName)
 {
     QFile file(fileName);
     if (!file.open(QFile::ReadOnly))
         return new QStringListModel(completer);

     QApplication::setOverrideCursor(QCursor(Qt::WaitCursor));
     QStringList words;

     QStandardItemModel *model = new QStandardItemModel(completer);
     QVector&lt;QStandardItem *&gt; parents(10);
     parents[0] = model-&gt;invisibleRootItem();

     while (!file.atEnd()) {
         QString line = file.readLine();
         QString trimmedLine = line.trimmed();
         if (line.isEmpty() || trimmedLine.isEmpty())
             continue;

         QRegExp re(&quot;^\\s+&quot;);
         int nonws = re.indexIn(line);
         int level = 0;
         if (nonws == -1) {
             level = 0;
         } else {
             if (line.startsWith(&quot;\t&quot;)) {
                 level = re.cap(0).length();
             } else {
                 level = re.cap(0).length()/4;
             }
         }

         if (level+1 &gt;= parents.size())
             parents.resize(parents.size()*2);

         QStandardItem *item = new QStandardItem;
         item-&gt;setText(trimmedLine);
         parents[level]-&gt;appendRow(item);
         parents[level+1] = item;
     }

     QApplication::restoreOverrideCursor();

     return model;
 }

 void MainWindow::highlight(const QModelIndex &amp;index)
 {
     QAbstractItemModel *completionModel = completer-&gt;completionModel();
     QAbstractProxyModel *proxy = qobject_cast&lt;QAbstractProxyModel *&gt;(completionModel);
     if (!proxy)
         return;
     QModelIndex sourceIndex = proxy-&gt;mapToSource(index);
     treeView-&gt;selectionModel()-&gt;select(sourceIndex, QItemSelectionModel::ClearAndSelect | QItemSelectionModel::Rows);
     treeView-&gt;scrollTo(index);
 }

 void MainWindow::about()
 {
     QMessageBox::about(this, tr(&quot;About&quot;), tr(&quot;This example demonstrates how &quot;
         &quot;to use a QCompleter with a custom tree model.&quot;));
 }

 void MainWindow::changeCase(int cs)
 {
     completer-&gt;setCaseSensitivity(cs ? Qt::CaseSensitive : Qt::CaseInsensitive);
 }

 void MainWindow::updateContentsLabel(const QString&amp; sep)
 {
     contentsLabel-&gt;setText(QString(tr(&quot;Type path from model above with items at each level separated by a '%1'&quot;)).arg(sep));
 }</pre>
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